Fabious Verritti, the Grand Duke of Ert'Aria wielding its highest authority, governs dutifully. He possesses ochre hair, blue eyes, and stands 1.85 meters tall. As father to Carina Verritti and husband to Fiore Verritti, his familial life is marked by his notable enthusiasm for charming young girls, especially Minette, whom he tries to befriend using sweets. This habit frequently embarrasses Carina, who often responds by striking him with her staff. Fiore generally tolerates these antics but deploys the maid Nina to discreetly intervene during risky public situations, like tripping Fabious to halt inappropriate approaches towards Minette. He prefers the affectionate title "Papa" over "old man."

Beyond ruling, Fabious boasts a past as an adventurer, journeying alongside his close friend Nagan Maycraft and the puppeteer Mise Altoise. These adventures honed considerable martial arts skills. In times of crisis, such as crystal monster attacks, this combat prowess resurfaces as he actively leads city defenders, employing dynamic, dance-like maneuvers. His relationships reflect complex dynamics: Carina's frustration over his embarrassing fixation contrasts with his protective instincts in danger. Fiore maintains a regal composure, showing no jealousy but implementing measures to prevent scandal. Fabious persistently seeks a paternal bond with Minette, offering sweets to entice her to call him "Papa."